Recently I was searching for degradation intermediate of aniline degradation using the Xcalibur software. Due to the behavior of the aniline concentration in the system I assumed that an -SO2 group might be added to the benzene ring and I then proceeded to search for the corresponding M/Z ratio. I got a clear peak appearing indicating the presence of the compound. out of curiosity I added an extra O atom making an -SO3 group, to my surprise the same peak appeared at about the same retention time. I am not sure how to interpret this result. Any guidance will be most appreciated. Thanks alot